Effects of carrier-attached biofilm on oxygen transfer efficiency in a moving bed biofilm reactor

Abstract

Three laboratory-scale moving bed biofilm reactors (MBBR) with different carrier filling ratios ranging from 40% to 60% were used to study the effects of carrier-attached biofilm on oxygen transfer efficiency. In this study, we evaluated the performance of three MBBRs in degrading chemical oxygen demand and ammonia. The three reactors removed more than 95% of {\mathrm{N}\mathrm{H}}_4^{+}-N at an air flow-rate of 60 L·h^-1. The standard oxygen transfer efficiency (αSOTE) of the three reactors was also investigated at air flow-rates ranging from 60 to 100 L·h^-1. These results were compared to αSOTE of wastewater with a clean carrier (no biofilm attached). Results showed that under these process conditions, αSOTE decreased by approximately 70% as compared to αSOTE of wastewater at a different carrier-filling ratio. This indicated that the biofilm attached to the carrier had a negative effect on αSOTE. Mechanism analysis showed that the main inhibiting effects were related to biofilm flocculants and soluble microbial product (SMP). Biofilm flocs could decrease αSOTE by about 20%, and SMP could decrease αSOTE by 30%–50%.

Keywords

carrier / biofilm / oxygen transfer efficiency / moving bed biofilm reactor

References

[1] Yang Q Q, He Q, Husham T I. Review on moving bed biofilm process. Pakistan Journal of Nutrition, 2012, 11(9): 706–713

[2] Javid A H, Hassani A H, Ghanbari B, Yaghmaeian K. Feasibility of utilizing moving bed biofilm reactor to upgrade and retrofit municipal wastewater treatment plants. International Journal of Environmental of Research, 2013, 7(4): 963–972

[3] Ødegaard H. Innovations in wastewater treatment: the moving bed biofilm process. Water Science & Technology, 2006, 53(9): 17–33

[4] Hem L J, Rusten B, Ødegaard H. Nitrification in a moving bed biofilm reactor. Water Research, 1994, 28(6): 1425–1433

[5] Li H Q, Han H J, Du M A, Wang W. Removal of phenol, thiocyanate and ammonium from coal gasification wastewater using moving bed biofilm reactor. Bioresource Technology, 2011, 102(7): 4667–4673

[6] Rosso D, Stenstrom M K. Surfactant effects on α-factors in aeration systems. Water Research, 2006, 40(7): 1397–1404

[7] Han S X, Yue Q Y, Yue M, Gao B, Zhao Y, Cheng W. Effect of sludge fly ash ceramic particles (SFCP) on synthetic wastewater treatment in an A/O combined biological aerated filter. Bioresource Technology, 2009, 100(3): 1149–1155

[8] Gu Q Y, Sun T C, Wu G, Li M, Qiu W. Influence of carrier filling ratio on the performance of moving bed biofilm reactor in treating coking wastewater. Bioresource Technology, 2014, 166: 72–78

[9] Mueller J A, Bovle W C, Popel J H. Aeration: Principle and Practice. New York: CRC, 2002

[10] Gillot S, Capela M S, Roustan M, Heduit A. Predicting oxygen transfer of fine bubble diffused aeration systems-model issued from dimensional analysis. Water Research, 2005, 39(7): 1379–1387

[11] Gillot S, Heduit A. Prediction of alpha factor values for fine pore aeration systems. Water Science and Technology, 2008, 57(8): 1265–1269

[12] Rosso D, Iranpour R, Stenstrom M K. Fifteen years of offgas transfer efficiency measurements on fine-pore aerators: key role of sludge age and normalized air flow rate. Water Environment Research, 2005, 77(3): 266–273

[13] Pham H, Viswanathan S, Kelly R F. Evaluation of plastic carrier media impact on oxygen transfer efficiency with coarse and fine bubble diffusers. Proceedings of the Water Environment Federation, 2008, 2008(11): 5069–5079

[14] Jing J Y, Feng J, Li W Y. Carrier effects on oxygen mass transfer behavior in a moving-bed biofilm reactor. Asia-Pacific Journal of Chemical Engineering, 2009, 4(5): 618–623

[15] Viswanathan S, Pham H, Kelly R F, Redmon D T, Fernandes W. Evaluation of oxygen transfer efficiency via off-gas testing at full scale integrated fixed film activated sludge installation. Proceedings of the Water Environment Federation, 2008, 2008(11): 4994–5001

[16] Xing B S, Ji Y X, Yang G F, Chen H, Ni W M, Jin R C. Start-up and stable operation of partial nitritation prior to anammox in an internal-loop airlift reactor. Separation and Purification Technology, 2013, 120: 458–466

[17] APHA. Standard Methods for the Examination of Water and Wastewater, 20th ed. Washington DC, USA: APHA, AWWA, WPCF, American Public Health Association, 1998

[18] Joanna S G, Krist G, Carl D, Peter V, Willy V. Nitrification monitoring in activated sludge by oxygen uptake rate (OUR) measurements. Water Research, 1996, 30(5): 1228–1236

[19] Duan L, Jiang W, Song Y, Xia S Q, Hermanowicz S W. The characteristics of extracellular polymeric substances and soluble microbial products in moving bed biofilm reactor-membrane bioreactor. Bioresource Technology, 2013, 148: 436–442

[20] Duan L, Moreno-Andrade I, Huang C, Xia S, Hermanowicz S W. Effects of short solids retention time on microbial community in a membrane bioreactor. Bioresource Technology, 2009, 100(14): 3489–3496

[21] Lowry O H, Rosebrough N J, Farr A L, Randall R J. Protein measurement with the folin phenol reagent. Journal of Biological Chemistry, 1951, 193(1): 265–275

[22] Capela S, Gillot S, Heduit A. Comparison of oxygen-transfer measurement methods under process conditions. Water Environment Research, 2004, 76(2): 183–188

[23] Borkar R P, Gulhane M L, Kotangale A J. Moving bed biofilm reactor- A new perspective in wastewater treatment. Journal of Environmental Science. Toxicology and Food Technology, 2013, 6(6): 15–21

[24] Gillot S, Héduit A. Effect of air flow rate on oxygen transfer in an oxidation ditch equipped with fine bubble diffusers and slow speed mixers. Water Research, 2000, 34(5): 1756–1762

[25] Krampe J, Krauth K. Oxygen transfer into activated sludge with high MLSS concentrations. Water Science and Technology, 2003, 47(11): 297–303

[26] Wagner M, Popel H J. Surface active agents and their influence on oxygen transfer. Water Science and Technology, 1996, 34(3-4): 249–256

[27] Sundararajan A, Ju L K. Biological oxygen transfer enhancement in wastewater treatment systems. Water Environment Research, 1995, 67(5): 848–854

[28] Hu J. Evaluation of parameters influencing oxygen transfer efficiency in a membrane bioreactor. Dissertation for the Doctoral Degree. Hawai: University of Hawai, 2006

[29] Gapes J, Keller J. Impact of oxygen mass transfer on nitrification reactions in suspended carrier reactor biofilms. Process Biochemistry, 2009, 44(1): 43–53

[30] Barker D J, Stuckey D C. A review of soluble microbial products (SMP) in wastewater treatment systems. Water Research, 1999, 33(14): 3063–3082

[31] Germain E, Stephenson T. Biomass characteristics, aeration and oxygen transfer in membrane bioreactors: Their interrelations explaned by a review of aerobic biological processes. Environmental Science and Bio/Technology, 2005, 4(4): 223–233

Acknowledgements

This study was supported by the National Natural Science Foundation of China (Grant No. 51408601).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg